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#           : '//' => '/', and 'a/b/../c' => 'a/c'.  We need this function
#           : with this behaviour, even though b could be a symlink to
#           : elsewhere, as noted in the perldoc for File::Spec->canonpath().
#           : This behaviour is deliberately different to
#           : Stow::Util::canon_path(), because the way join_paths() is used
#           : relies on this.  Firstly, there is no guarantee that the paths
#           : exist, so a filesystem check is inappropriate.
#           :
#           : For example, it's used to determine the path from the target
#           : directory to a symlink destination.  So if a symlink
#           : path/to/target/a/b/c points to ../../../stow/pkg/a/b/c,
#           : then joining path/to/target/a/b with ../../../stow/pkg/a/b/c
#           : yields path/to/stow/pkg/a/b/c, and it's crucial that the
#           : path/to/stow prefix matches a recognisable stow directory.
#============================================================================
sub join_paths {
    my @paths = @_;

    debug(5, 5, "| Joining: @paths");
    my $result = '';
    for my $part (@paths) {
        next if ! length $part;  # probably shouldn't happen?
        $part = File::Spec->canonpath($part);

        if (substr($part, 0, 1) eq '/') {
            $result = $part; # absolute path, so ignore all previous parts
        }
        else {
            $result .= '/' if length $result && $result ne '/';
            $result .= $part;
        }
        debug(7, 6, "| Join now: $result");
    }
    debug(6, 5, "| Joined: $result");

    # Need this to remove any initial ./
    $result = File::Spec->canonpath($result);

    # remove foo/..
    1 while $result =~ s,(^|/)(?!\.\.)[^/]+/\.\.(/|$),$1,;
    debug(6, 5, "| After .. removal: $result");

    $result = File::Spec->canonpath($result);
    debug(5, 5, "| Final join: $result");

    return $result;
}

#===== METHOD ===============================================================
# Name      : parent
# Purpose   : find the parent of the given path
# Parameters: @path => components of the path
# Returns   : returns a path string
# Throws    : n/a
# Comments  : allows you to send multiple chunks of the path
#           : (this feature is currently not used)
#============================================================================
sub parent {
    my @path = @_;
    my $path = join '/', @_;
    my @elts = split m{/+}, $path;
    pop @elts;
    return join '/', @elts;
}

#===== METHOD ===============================================================
# Name      : canon_path
# Purpose   : find absolute canonical path of given path
# Parameters: $path
# Returns   : absolute canonical path
# Throws    : n/a
# Comments  : is this significantly different from File::Spec->rel2abs?
#============================================================================
sub canon_path {
    my ($path) = @_;

    my $cwd = getcwd();
    chdir($path) or error("canon_path: cannot chdir to $path from $cwd");
    my $canon_path = getcwd();
    restore_cwd($cwd);

    return $canon_path;
}

sub restore_cwd {
    my ($prev) = @_;
    chdir($prev) or error("Your current directory $prev seems to have vanished");
}

sub adjust_dotfile {
    my ($pkg_node) = @_;
    (my $adjusted = $pkg_node) =~ s/^dot-([^.])/.$1/;
    return $adjusted;
}

# Needed when unstowing with --compat and --dotfiles
sub unadjust_dotfile {
    my ($target_node) = @_;
    return $target_node if $target_node =~ /^\.\.?$/;
    (my $adjusted = $target_node) =~ s/^\./dot-/;
    return $adjusted;
}

=head1 BUGS

=head1 SEE ALSO

=cut

1;

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